Neil deGrasse Tyson Explains Earth’s Magnetic Field and Magnetic Poles

We all know about Earth’s magnetic field, right? Well, Neil deGrasse Tyson and comic co-host Chuck Nice are here with another StarTalk Radio explainer to fill you in on the things you might not know about Earth’s magnetic field and magnetic poles.
Find out why Earth’s south magnetic pole is actually in the North. We discuss how Earth’s magnetic field is not aligned with Earth’s rotation axis. You’ll discover why when you use a compass to find North it’s most likely pointing to somewhere in northwest Canada.
You’ll learn about the differences between Earth’s magnetic poles vs. Earth’s geographic poles. Neil tells us how to actually find true North. Neil also explains why the magnetic poles of the Earth flip and have flipped many times. We discuss the “dynamo theory.” Lastly, we take a look at the Sun’s magnetic field and how that impacts sunspots. All that, plus, Neil tells us why there’s no understanding of magnetic fields without quantum physics.
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About the prints that flank Neil in this video:
"Black Swan” & "White Swan" limited edition serigraph prints by Coast Salish artist Jane Kwatleematt Marston. For more information about this artist and her work, visit Inuit Gallery of Vancouver inuit.com/.
About StarTalk:
Science meets pop culture on StarTalk! Astrophysicist & Hayden Planetarium director Neil deGrasse Tyson, his comic co-hosts, guest celebrities & scientists discuss astronomy, physics, and everything else about life in the universe. Keep Looking Up!
#StarTalk #NeildeGrasseTyson

[@umanggada8684]

I forgot my password. Google: what was your last password...

[@bdr420i]

Weirdly it works sometimes 👌🙃

[@mvadu]

It actually asks for last "known" password.. Not necessarily the one you just forgotten, if you remember one you used before that, it works to validate your identity.

[@ahmedhassan129]

😂😂

[@diegoantoniovargasparedes5584]

@mvadu my friends ask for a “known” location of my keys... not necessarily the one in which I forgot them. I don’t think if I remember an arbitrary location for my keys,my friends will validate where they are now. (jokes aside I understand... computers have a large database of passwords and I can find one that validates my identity)

[@xxxgammaxxx]

Last password I forgot cost me some irreplaceable pictures. Luckily, I can't remember which ones they are/were.

[@tanyaparker-callsign.kk7ic238]

Love this channel breaks away from civil,political, and social madness

[@objectivemillennial2117]

if trumpers were watching this show they would be saying racist stuff to a successful black man

[@Obscurai]

Well Canadian healthcare was mentioned ...

[@saikatJanaYT]

Yeah 😊

[@Lyxtwa]

@@davidsandall A quick glance at Let's Play VR's channel likely reveals that their comment isn't made sincerely.

[@FinancialDestruction]

@@objectivemillennial2117 trump 2020 & i love and i listen to Neil's podcast all the time

[@ChrisLhamon]

The North Pole is the south pole? You've turned my world upside down...

[@Mr2winners]

Or the north needle Is just south polorized

[@alangarland8571]

No, you're OK, the Earth is flat.

[@doctorsticks]

Alan Garland the earth is a pyramid wdym😂

[@ihaventshoweredforayearbut247]

Bruh the earth is your mom

[@alangarland8571]

@@doctorsticks That's what they tell you to think

[@tadejjovandic188]

Thank you Neil for bringing me science in understanding way. Love your channel. Greetings from Croatia, Zagreb 🙂

[@markmakabuhay2009]

@Science Revolution are you dumb or what, with no magnetic field we be roasted, dead af

[@ctpatten4798]

@Science Revolution Glenn

[@jameskinderberg7589]

Love the info spreading!

[@gabrielhandfieldpoirier4150]

@Science Revolution ok

[@mxb2432]

@Science Revolution not because you don't understand something that it is a lie.. damn 🤣 But please teach us then, How do they aurora borealis form? (Yes it is not ONLY because of the earth's magnetic as I can understand but I'm all ears. Tell me! Please!)

[@kenbee1957]

"But wait, there's more!" Chuck: Oh oh

[@ZeroOskul]

15:37 Neil explains exactly how maglev trains work. 15:42 Chuck says, "That's how the trains run." 15:45 Neil replies, "Maybe, I don't know enough about trains." 5-points for Chuck.

[@manonearthyeep9940]

What ? When 🤨 -- he is talking about change in domain rotation of an element using electromagnitic field.

[@ZeroOskul]

@@manonearthyeep9940 The maglev works by shifting polarities of magnets under the train. It's the same thing. I would assume everyone as interested in science and technology as Neil is would know as much about maglev rail as Chuck does.

[@steve-o6413]

Mag trains run on a linear motor configuration...

[@ZeroOskul]

@@steve-o6413 Okay. It still shifts the olarity of magnets under the train.

[@steve-o6413]

@@ZeroOskul changing current flow changes the Polarity since it's linking Electricity and Magnet (Electromagnetic Field), just like reversing the wires on a electric motor and running it in reverse...

[@Idontknow-hv8ci]

Neil and Chuck are such a great duo

[@taotaostrong]

Samuelita Guerrero They are! And their chemistry is proof that Neil simply doesn’t like Joe Rogan. 😂

[@kyzyl4915]

I disagree tbh

[@trent797]

It's really interesting that the sun's magnetic field switches every 11 years. That seems super fast, and it is rare that we can see some astronomical event like that multiple times in one lifetime.

[@TJXD]

Wonder if the magnetic properties in the surface or outer core is to blame for that

[@mikev4621]

@@TJXD hard to know without knowing what mechanism the sun's dynamo is- it can't be a metallic core like Earth's

[@vietfocus555]

I like how Chuck is really inclined to learn from Mr Tyson but at the same time they take it in a relaxed manner. The air is not too serious but yet educational.

[@mattheweagleton5515]

Regardless of how Chuck comes across, a SIGNIFICANT step towards educating a large group of people is making it ENTERTAINING! Something about Neil and his mannerisms (except his habit of interrupting people) is that he makes learning fun or at least enjoyable. I salute him on his help towards a better humanity

[@aswinbalamurugan6114]

Dr. Neil Tyson and Chuck Nice taught me more stuff than my Engineering College Professors. 😎

[@cerealnotfound]

I bet

[@aswinbalamurugan6114]

@@cerealnotfound I believe you are an Indian Engineer.. Lol😂

[@cerealnotfound]

No I am just in class 8 😂😂

[@cerealnotfound]

I wanna be an astrophysicist

[@cerealnotfound]

There are some teachers like H.C Verma that teach better with experiments as well but some teach like 🤮

[@nffcdan2387]

"I'm lost" "Where are you, I'll come and find you"

[@Wineman3383]

Love this show/channel. Hope it carries on for a long time. Neil is such a great teacher. And Chuck is a perfect pair. He seems so genuinely interested in all the subjects.

[@SadekMerchant]

"Aren't these two the absolute best!", said the North to the South pole.

[@kasiopeeya]

Knowledge is power.

[@masternobody1896]

its gets boring when you know most of the stuff

[@Dalek_Scientist]

@@masternobody1896 r/iamverysmart

[@gidstam8467]

@@masternobody1896 You are extremely ignorant, there is always more to learn

[@epicswirl]

MASTER FAZE Try hard gamer you know the basics. Not everything. Sad boi hours 🙁

[@ZangariRC]

The wisest knew they knew nothing at all..

[@josephjeon804]

I love how chuck adds a hint of humour with neils science

[@elitecol69]

Chuck is super annoying and I can't stand him

[@josephjeon804]

@@elitecol69 oh ha ha personality diferences i gurss

[@ibrahimjaleel5900]

I love this channel. Learned something about magnetic field. I wish if there was highlights about how the Gyro Compasses work, as it’s without magnets.

[@Posiadam.]

I’m pretty sure sun’s magnetic field flipped in early 2020.

[@ikaabuladze6510]

tru

[@MegaSkills9]

It did briefly. Also...in 1989 (March) a HUGE CME hit Earth and flipped the magnetic pole for almost 15 min. Canada had a large area blackout of all their power. The public was not informed due to possible panic but Astronomy magazine did a story on it. Wikipedia still has an article on the main event but doesn't mention the pole flip. Why hide science news from people?

[@bigfatbaataed]

I beg to differ, I think it flipped in November 2016...

[@theduder2617]

@@MegaSkills9 Think about your source and the answer to your question will become clear. "Wiki" anything is user entered/altered data. Anyone capable of typing and following format guidelines can add, remove, or alter any wiki page in existence. It's not that anything was hidden, because nothing was. The science is there for anyone willing to look. The person who wrote the page either did not know, or did not deem it fitting for their write-up. Or the pole flip was mentioned, but poorly described. Basically, if it is on wiki anything, tread carefully. Further investigate what the page is saying. Because I assure all humans on Earth, wiki themselves care not about accurate information. It's all up to the users.

[@theduder2617]

@Toussaint Louverture Care to clarify that?

[@paulgrote7139]

Neil: says something Chucks brain: this is riveting stuff!

[@destroyer6470]

Earth always at full tilt but this year its got some engine knock

[@anshumanbebarta6386]

First time I've heard Neil say, "I do not know enough about..."

[@Zombie-lx3sh]

That's nonsensical. What he said was "I don't know enough about..."

[@timdowney6721]

Anshuman Bebarta The mark of a wise man. Fools think in certainties.

[@araitol3935]

"A true master is an eternal student"

[@dubemmba9602]

I’m sure he would have gone back to study it

[@-Zevin-]

Really looking forward to your take on the exciting Venus discovery. I hope there is a entire upcoming Star Talk about it.

[@astrophysicist4171]

Zevin X There should be one soon. If you follow @startalkradio on Instagram they posted a cosmic queries post about it.

[@ZeniferJenZ]

You two are magnetic 🌐

[@odertube]

What an attractive comment

[@humanfrommars5832]

@@odertube I have developed a repulsion

[@ZeniferJenZ]

@@odertube 😏

[@samfaraiphiri8773]

Some animations would really suffice like how you did with water tanks.

[@eldino1504]

This channel talks about things I greatly enjoy, I learn new things, easy to follow along, and lots of comedy. Possibly the best channel on KZbin when it comes to things like these.

[@aaronseet2738]

Can flat-earthers pinpoint where "south" is?

[@peterbarratt8699]

Nope.

[@MaegnasMw]

There is no south, it's all government conspiracies to keep us under control! :P

[@andrewcarr2431]

I suppose logically it would be the center of the disc...

[@sahishnoobr3101]

@@MaegnasMw how convienient that tens of millions of governments and their officials around the world have kept this secret for so long

[@MaegnasMw]

@@sahishnoobr3101 you do understand I am joking, right? You saw the ":P" at the end.

[@adityakulkarni9455]

" That will stick with me for a long time '' Chuck's spontaneity is on another level 😁

[@TanksForTheMemories]

chuck has legit come sooo far in his comprehension it's awesome to have him repeating his own interpretation of what Neil is saying !!

[@anthonykiprop2360]

Much love from Kenya,Africa. making me understand science in a much more easier way.

[@wayne0liphant795]

Greatest show on the air. Love these guys and the brilliant guests. A lot is over my head. I am poor at math. The explanations for me makes it interesting Niel will kick it down a notch a few times every show. Thanks guys

[@JuanAMota-pu5zx]

Some species have an internal compass. Mine points to StarTalk, great video!

[@dmytrodance]

Cool vid, guys! Tell about issues with compass navigation in the mountains (declination, deviation)

[@williamlundbergh5683]

For 20 years I wondered why my compass would only point South. Now, I know. So enlightening! Thank U, NDT, again!!

[@bestintheworld8803]

When does the gasses on Venus (showing potential life) come out

[@bobbylewis3905]

When it's true and not just clickbait

[@shivankaggarwal711]

So a research paper is a clickbait to you?

[@jz807]

Ask on their website

[@lesalabs]

I sent some lawyers to Venus so there are some gasses of lower intelligence.

[@Runyamouth]

@@bobbylewis3905 hahaha

[@robinhooper7702]

Interesting. I always thought that the red end, of the needle, that pointed to the north pole was magnetized south. Same thing I guess just the other way around. love this show....

[@shieldcracker]

It could very well be. The truth is North and South poles are only references that are releative to each other. You could also say that all compasses point to the south pole and still be correct.

[@robinhooper7702]

@@shieldcracker I must disagree. Yes the North and South poles are merely references but realize that natural products like magnetite/Loadstone orientates itself relative to the repulsion and attraction of Earths magnetic field. When you magnetize a metal object to fashion a compass you are orientating the molecular di-poles within the material, knowing that opposites attract and like poles repel. Our earths field is fixed it is our interpretation how this is translated. Case in point: I am a true believer in relative perspective/Einstein. Go ahead, if you have the means. Take a ball, any ball, I used a tennis ball. Using a felt marker I started at the top of the ball and drew a spiral going down clockwise until I reached the bottom of the ball. You will see that once you reach the equator you will now be moving your felt marker in a counterclockwise direction. So from the relative perspective of, let's say, flushing water and or your felt marker. Is it moving in the same direction?...I think yes. But from the point of view of the observer it is going the other way. And this is because the observer is on the other side/upside down. You can further confirm my observation by simply having a buddy sit across from you and hold a pencil on a horizonal plane relative to each others' point of view/eye site. The person across from you will se the pencil rotate in a clockwise direction and you will see the pencil rotate counter to the direction from the other observer. Thanks for you feed back. Have a great day.

[@maureenpowers3331]

Neil, you are so awesome with explaining things!! Love your knowledge!! Thanks so much for educating the rest of us!!! You are the best!!

[@udopiarecords]

The ending here just took this whole episode to another level, we need a whole segment on electromagnetism and exploiting the quantum realm!

[@jeremiahc3697]

“Directions in the hood” 😂 I love these guys. I was Raised in castle hill projects.

[@TheDiabeticHiker]

Love it! I love the content where the general population takes these things for granted, but Neil and Chuck discuss what's actually going on. Much more informative than the VSauce channel and entertaining. Keep up the great work guys! You deserve more likes and subscribers.

[@anamartini3147]

It's so great to watch a podcast about what I study and develop research about

[@rossb1409]

Love the show and the learning as always! Can I ask about the South Atlantic Anomaly then?How does this fit into magnetic 'system' if you like of the Earth.... and what happens should it just continue to grow? Thanks!

[@lxathu]

I feel astounded day by day. It's mind-blowing that a physicist* tells stories about the nature of nature and I can hear and see that within a couple of hours or even minutes on the other side of the planet. Even if I don't like this era in every way, I love this feature. This is a value we cannot overestimate. (*And similar is true to a bunch of other professionals and areas.)

[@joerillarilla8524]

I agree. Since is supposed to be that way. Not cramed down ur throat and called a vaccine.

[@timrico1377]

Love the show guys. Thanks

[@jeanine219]

So interesting and informative. Thank you Neil and Chuck!!

[@uddaside]

As an Electrician that had to study Electromagnetism and Lenz Law, I find this fascinating.

[@Xkalaber]

Chuck had me rolling in this one

[@achesley43]

I had forgot that I studied the 11 year cycle and it's effect on HAM radio in the '70's

[@theduder2617]

What did your findings show that could possibly be applied to our much faster signal speeds of today's cell phones for example? Was there any effect to begin with? Yes, I know I could investigate. But a chance to directly ask someone who actively studied the topic is rather rare. I like first hand information when possible. lol

[@EDUARDOCAPANEMAecapanema]

Great episode. Funny and informative. Thanks, guys!

[@joelepack938]

we Canadians love you guys too!

[@yomeki]

i have many questions about this, how long it takes to flip the earth magnetic field and what effects does it have on a compass? is there a way to use that magnetic force and make things levitate?

[@justafunnyclown6831]

I can only kinda answer one q1: It takes hundreds millions of years for them to flip but it actually varies to subduction

[@hellaswagga2205]

I had been waiting for a video from StarTalk since the last video and when this came out, it was the happiest moment of my day. Just 18 hours in, I am craving for more. This is a serious addiction man. PS: Hats off Dr.Tyson and Chuck.

[@EXNY]

yourvoice is so comfy and ill go to sleep in no time when i listen to you talk

[@careliatapiaflores6404]

I love this channel! Following since Cosmos ☝🏻🙏🏻❤️

[@brianzon7421]

When the Earth's magnetic field flips, does the compass react to it? Does the compass point south instead of north?

[@nkhasselriis]

"When my tibula is sticking out of my leg..." - Chuck Nice Tibia + fibula = tibula😂

[@1tthorr2]

Tibula

[@TheEscapingFate]

This is great stuff 😊 I would love to learn more about electromagnetism.

[@peterbarratt8699]

Every library contains such information.

[@jpteknoman]

this thing reminds of an old tech support call in the late 90s when cellphones were the hot new thing. "help, my phone has no signal" "what is your location?" "Billy's house"

[@davidgould9431]

Hee hee - 6min(ish) - "if you know anything about astronomy, you don't need a compass". So, if I'm lost on a cloudy (I'm British - roll with this) day at about 9am I have to lie down and wait 12 or so hours to work out where I am. Assuming the clouds have gone away. Also assuming my GPS-toting phone (or watch or whatever) is bust, I reckon a compass is my next best option. Unless I can find a tree and hope it has green, fluffy stuff growing on what will be the North side. Or something. I love Neil and Chuck - they really brighten up my day. And I find out cool stuff, too. Edit (inter alia): NdGT did mention the problem with clouds later in the chat.

[@spacedoggo7655]

There's also a way to figure out north using the position of sun in the sky Edit: nvm just read cloudy

[@JamesScholesUK]

@@spacedoggo7655 if it's cloudy, the brightest part of the sky is where the sun is. You have to learn this stuff in the UK

[@davioliva6675]

We need a video on venus Neil, we wanna know your opinion on the recent "life" discovery/hint

[@francisbobi9286]

Hooked onto this show. Found out about it months ago and been watching every single episode.

[@Marawan]

Chuck and Neil joking is the best thing I have seen in a while

[@airfishboy5386]

I love how Neil laughs at dumb little jokes. He’s such a relatable scientist.

[@musaddiqmunirliman8267]

This show needs subtitles for some people

[@pbinsb3437]

Click on CC (closed captions) for subtitles. Bottom right on all videos.

[@fafasogamer6320]

@thahll dajj what

[@haseeman5562]

@thahll dajj wait, what

[@musaddiqmunirliman8267]

@@pbinsb3437 Yeah... they're some important words that it just can't seem to grasp

[@kodakincade8063]

Musaddiq Munir Liman lol not even important or big words. It seems to just fill in whatever it wants 🤦🏻‍♂️

[@ResearchThis]

Magnetic fields are amazing and mind boggling! Thanks for explaining this, I'm so stoked 🙌 I am a profound magnet lover...I just feel drawn to them.

[@Todd1990]

Im blessed to have lived the time this guy is atound.. Neil Degrasse Tyson

[@hdrodic]

I do not remember where i heared that not being protected by earth's magnetic field could be bad news for our electric and electronic stuff

[@ripulus]

I diden"t know the sun's magnetic field switched every 11 years. Everything else....yep.

[@domenicputti4228]

You also diden"t know how to spell

[@ericscaillet2232]

@@domenicputti4228 that gets sorted every 11th year...

[@grandmasterapple6355]

That’s also in accordance with the solar Maximus

[@Zombie-lx3sh]

Yes, this episode was a bit disappointing, mostly filled with well known general knowledge.

[@dustinswatsons9150]

Solar system is a computer? Not bad

[@maxmad9865]

Neil your the greatest teacher I love listening to your words your knowledge brings me joy

[@8razz13b]

I didn't know any of this. Thanks so much. I love to learn new things.

[@5SMA]

That's why I never cared much for magnetic compasses. What I want is Captain Jack Sparrow's compass.

[@light-master]

North/South is just a label we apply to magnets, so who's to say that the "North" needle on a compass isn't really a "South" needle pointing to the earth's magnetic "North" Pole?

[@ASJC27]

Because it's not an arbitrarily assigned label. Once there was an understanding of magnetism, it was defined based on the direction of the magnetic field. The magnetic north pole is the one that the magnetic field lines radiate out of, and the south pole is the one that the lines converge into. Once that definition was made, the north pole of a compass needle is only ever a magnetic north pole, and the earth's north pole is actually a magnetic south pole. It can't be opposite because that would require a reversed field.

[@tanadarko6991]

I never knew who Chuck Nice was before these... and I'm so so glad I do now. I like how he's not a scientist but he's a smart dork who just loves having his mind blown. we both yell at the same time with stuff!

[@julieinthedesert420]

I got to discuss the polar flip back in 2003 in my Earth Science class in college. It's so interesting and happens in intervals. We're due one now or soon. ❤

[@anshulsharma9424]

He is my favourite educator though I also like bill nye

[@Ishmari]

Didnt bill nye get caught selling and manufacturing drugs? Some ppl say no but im pretty sure i heard about it on the news a few times. Mandela effect?? 😮

[@theeendo3677]

It makes me sad to see Neil getting old. Dont leave us,we're not ready! 😢

[@theeendo3677]

@Stevo Devo well..he's definitely past the halfway point (61)

[@theeendo3677]

@Stevo Devo I'm just a realist. His glass is definitely more than half full lol

[@davidbrettell75]

I am a big science fan. You two are awesome. Your entertaining and funny and educational. The holy Trinity of science education. This needs to be in schools everywhere.

[@taqihasan6666]

I really love ur explainer videos, u r amazing Tyson

[@Rykojames]

When is someone going to let these guys know that they don’t have a time limit to “run out of”

[@Tim-K.]

It’s not like this is their full time job. They have a schedule and other responsibilities. NB I like that they’re spreading so much knowledge and especially the intention behind it, but NDT is director of a planetarium and has a lot of other endeavours, so it’s only logical...

[@Rykojames]

Tim K. if you care about something you’ll make time for it even if they are as busy as you suppose. Which they aren’t.

[@Tim-K.]

Avesta Okay, you’re implying that you know their schedule and that the planetarium isn’t important, can you elaborate with evidence on that or do you want to keep spreading disinformation? Why don’t you contact them to help them? Because: “If you care about something you’ll make time for it”

[@DiCola119]

Fun fact: In aviation, navigation charts are all plotted relative to true north (geographic north), however pilots determine their direction of travel using magnetic north because that's what the flight instruments measure inside the aircraft. So this has to be taken into account when pilots are planning flights. This angular difference between magnetic and true north is called "magnetic variation", and the degree of variation varies greatly depending on your position on the globe.

[@danielchauta]

Love your guy's showww I always look forward to each episode (:

[@naudiatf2791]

these 2 are the best combo i never knew i needed XD enjoying laughing nonstop while also learning at the same time for all of their videos together

[@furonwarrior]

Hey Neil, can I get a reply since I am early? 😄

[@jagdishgohel2577]

Same here man 😂

[@tedswiderski4773]

What borders on insanity? CANADA and Mexico

[@mollybell5779]

I really enjoy StarTalk. Also, before discovering this channel, I had never heard of Chuck Nice. I got to say, he really makes the show for me.

[@mollybell5779]

Hahaha! I liked this comment, and had started to reply that I feel exactly the same way, then realized it was my own comment that I was replying to. 🙃😂 Okay well at least I am consistent. 😁

[@andrewhay3317]

These short videos are perfect timing for chopping some green and thinking about the universe.

[@aratakeneikawa6589]

Last time i was this early, Last time jokes weren’t a thing yet

[@jmonie02]

Just as fascinating as finding out that every race evolved from black folks

[@stephensmith3111]

Deep ancestry. :-)

[@kataba6845]

Hi Neil, could you please explain what happened to the magnetic field on Mars? Thanks! Loved the episode

[@Nanoamps]

Have always loved Dr Tyson and his incredible talents for teaching, but Chuck just doesn't get the mention here nearly enough! Always funny, always leaves me either in tears or with a smile.

[@DatGinnga]

Those painting are DOPE! 👍🏻 (the bird and the fish)

[@mpoboy71]

I always learn something new watching his videos

[@Magnusfication]

The hood directions cracked me up. I was not ready for that 😂

[@MichaelOKC]

Always have been a fan, but this episode really was just what I needed before bed! LoL. Love this as I drift off to sleep!

[@jotcw81]

I use star talk to fall asleep for like a month n'ow, it works 100% all of the time.

[@lmWeird]

Low key been waiting on this.

[@seanbatiz6620]

Some handful of years ago, say 2010-ish, I discovered one day by pure happenstance while just playing around aimlessly with google earth on a tablet that it would digitally go totally bonkers if to the pole regions (this digital phenomenon would occur @ either pole) were too near the dead center of the screen, and would effectively cause the tiny little digital compass icon to just spin out of control! I don’t think that app will do that anymore on any devices now, due to many app updates over the years. Just remembered that because of the last little fun factoid of info you, Neil deGrasse Tyson, mentioned at the end. 👍🏻 Another FANTASTIC episode‼️ KEEP UP THE GREAT WORK ‼️

[@VladimirDonkov]

Compasses are still widely used in today's smartphones and their main purpose is to determine a direction - knowing your position is not enough if you don't know which direction should you go. I think some navigation apps use it as well, for the very same reason. But anyway, just another amazing video of Neil summarizing scientific facts in a brilliant way. And the teacher-student format is great!

[@dennisfujihara9270]

Awesome time extremely well spent.

[@trevorlaing6326]

Thanks for making this episode.

[@mariettacarroll3343]

Just love you Neil and all your ways of explaining everything about our earth and the universe

[@navneetkaushik2482]

Never understood this until now, Thank you.

[@hka11726]

I wish you talked about the changes that happen during the flipping and whether it's happening right now, or not